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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27cfc08c1e104629a85c7cf12a0239bd7fa5391cebcd15f4c3e38f4f470c78b' 
  AND token = '9B7F3Jr5kA8+0K1x+E56y4mraPSjrKFM62fk/Yzdwto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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