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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8081f7911b44068262944d1fd137ca987ceda053d1a0a00b03f3aea83401a47a' 
  AND token = 'NUw63QsRiaItwn5p4fhlbv84IGuZ0UQ3pwZOehmL4MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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