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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee5c6ead387c8530912db3f82ee5068cd66369f08c9523f99a200a908637164' 
  AND token = 'oe0Z+Id/IfgzwpsvxNg8Uo5xSn4w/t3In95tZ4llfPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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