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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c613b0881ff6c98bb8de1d494bbf75f403e3d090b4aa44f4fbd710563c9200cf' 
  AND token = 'VTBRsMeuuQbXULT55JT7xCiWLueE9h0kNAVFJoJdG9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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