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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2ee6d69cf13e562f02e774adafccb9fd322a0494d7d14df55a2a1163752dd7' 
  AND token = 'mEsaMdpwf4wSmG9/LwE8FI/mtR39K8XyinuEfByS3HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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