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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1310ec2285ffa5799a718c4686d4415feb5f20859f9f4f2862f728f83353137a' 
  AND token = 'd9v275SyLdJcKHJ/1xsJIKHagLJY7fdzRtWeB+HlHcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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