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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc7e6e2f503159dbb28b46c1e6e11a16ec1972999b8350ee6627ab5928ea208' 
  AND token = '53x72K9U9fv19oxTqjnX8RA5ScJWbM0HqW9Oh1A+UBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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