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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac26da73d8578cae6d220d822209f131388476efd4d32cafa647a5180c8a0b62' 
  AND token = '98bCpbbBJaGpZVgzADFSpmCA2cTNdMS7e+tjf3yPLPc=' 
  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"
    }
  }
}