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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81be7abee8a42cc50a2aae37b5a6cdaa1db5ef0e3c08eeb0375144a8e660a3a3' 
  AND token = 'qqI1oItXLoKDCdNefgo8frTbAyIvbxNmE1MotOfxEb4=' 
  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"
    }
  }
}