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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6e7a4410f9ecd00f1ee319239783d3bc3b78ec6d6222e5cbdf57d1e22bacaf' 
  AND token = 'BYPcVQZ9R45622v1budkrR3bxBwF3rheup3NGwBaklw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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