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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203850e3cc7b13286ada91d96cfed54cdfeb209c1125368af7b2fcf67ad9a664' 
  AND token = 'kw/Dj3a8LhRLawSasEx/DhTlXOQerxTh4l3lM/YonWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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