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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27d6a37e3cab3c21e9a817dd14fe68428c755ce150b51a567981ba6b70ce115' 
  AND token = 'CGvEX0rfczJWMWKRh0Upn/Lt/hEbFVrvk+XNdiiGy14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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