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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5544d508521c65b6be1a2a21f190cf774e0526a0c746043b489bb4666b234434' 
  AND token = 'mdRUI+4x4BL2AGLpxa9jL3DgZOmjH3f9VFrfidwimK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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