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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1f8b760d3aebf36b0a27537c5710d2ab02cab3a607a3a877c5062d3a5afbec' 
  AND token = 'FHUV1q389duOdErOTqC9im+19vqsfNq5J5fdkzPJvm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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