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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2eff6bd70e04637307bb977ac96b153cb9a9ec8b7709dfbf33416a557c3bb3' 
  AND token = '8+osx0D6/E7TMYvhId0yKsQlGOrFKG46dr0UYKLtTWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00327

JSON explain

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