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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1c8e00451e1feca70cd64116c84377709964625f9f8680f690ebb5183c8db4' 
  AND token = '4Kgj8UfNUJ2ZNjo7kl/nxRBi4xsS2+6nHS4ijNE++80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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