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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9d10ac6b3614d063c90f630f85f3f6b48d787f87e4153575c99f5f1d178b00' 
  AND token = 'j1mfR6yzcr4BE5q7rjdBk5Pt2nbeEI8HT+pUiBnSfQY=' 
  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"
    }
  }
}