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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c29717246d68b006beab1d2cfcc8e0f4bfa7709ac2b0995d61bc842f8b808af' 
  AND token = 'cphhNj5JaF0u6djmQKstKHeMMsVqHnT2AIx0irjtKO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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