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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50b7e71f627eca17bf196cd84c0d2973b6bbedae99dd77749d2d867a176d6d2d' 
  AND token = 'FL/4tnx/mlgUhWsUrfRQdUbnEaf6555Fs+sB8IMuA44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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