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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7b79a39601a94d02325dce1bc1a41b0d3c593b6e3548e2ac2b2683b9561e4f' 
  AND token = '7KMDSxFDz0FDTdEhA/xlADG10H6YBFpK+4i1D7JSO68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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