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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4c8ec10f3e75d2e9e24ca96feafb2256e5232c4588f501841ca75dff9b0a74' 
  AND token = 'fFaWWwhmP1RumBy2jKrJqOd5fS4E1g84av7VQmunqx8=' 
  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"
    }
  }
}