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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57674b90edf54c1370b849df659ed538d24a54fd6188eec35d5d583df36408d0' 
  AND token = 'i9qICdxV+v2h4ryZdLAaM4wmc7jgOc2M37gRt8EnBeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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