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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1b8b1c419ab94dfdc91b8abe3a22209b264a2949dbcf8482238edc8c8ca28e' 
  AND token = 'hu4Zhi8AXL1to+fxmv/ofNc5QfU7kWNhBgxVA0desY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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