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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65cc598f0ba5fac9471203bf9f1d416dde752fe904d16603db5fe70a7d4d1d2' 
  AND token = 'oG5i3R8GzsSxVVTQ0xdL9eMqEbgLZkEhXEoIx4bjz5o=' 
  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"
    }
  }
}