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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292da8a83806818b0625581b48800dae1f863a6f621cd6b384b561a85ac267f6' 
  AND token = 'aWEgkwuHgG4jNNAoFotyXj1moL0GK6IBdcnHhFJQqIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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