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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ad1f259e71cb0d4624da74850be187d6079f2e5149ce1b475fbbd18e5a2e88' 
  AND token = 'niP/ofXANDTc/A2fpHD+kY5Q8h96iavJLgEv5/8+ueM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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