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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6586cd3613df0b6f31017b7817f29016d04c18da6a9c6154ca94d70cb2aa348c' 
  AND token = 'lhOr+zwNceC9G+8x6iTXFrNEPY1totwDUqmESHPedFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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