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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88330286848d243189396ce5c178becf93ae9c1e85452711a07665b7f8a64c4' 
  AND token = 'IuHW5OwrN2yjtJ31ARI0WB2jbQU2A0mCOV9xhi7ddhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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