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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e854003111dfc91b96e1bf2069217de9d54f5136dac3b49c45c533f88a75f595' 
  AND token = 'Y+BQxEiLxgW32l8uMWd0HynSYSOH+i8R+ZO4DEJJrmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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