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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643e3429acb036fc625ed63cb0da834a3d2e1230edba985fc171fb4165d45c04' 
  AND token = 'QoC5ieF+2K5PNtZNKH9epOma/hkADbYrs1D7+t53kmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}