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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a69c9eafb0c69e9ff72fae551866fae0187e9d91b2de0b92e7b8843ef39bbd2' 
  AND token = 'I8tDljarmFD313Wq8e9b/mIRtkl848W/lfPfNxY/2E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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