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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e3b607e405feb9979e297b415c1b3a861bd699d3cb4516dbc19931f5d0317f' 
  AND token = '7+0JtI2ppOFSMGPJkapLCqP9lsC5w+BPqBJhWpRe9N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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