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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a056af2c6d98f34e0dc880a34d01de11ba9409bc58d13b4f401fe3d371aad2d7' 
  AND token = '3NgDnR/I08t3yPTer3xDeqZ9ky/24ycf0S3GRMJEdL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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