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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3808758edcabdaf3b54f90fe5a8dbe9bb959f97348ac852d4a9d798e4d1812' 
  AND token = '7kJLCbdr72MM47bndaFRV05Ktm//T6y+pfClfqgSmuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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