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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1f7cf4b67fad835630060c449fce70eec4b844c2fe3b7b4e42bc1f360c10a1' 
  AND token = 'bcr6weD3IzA1s/on2DhVGDjmTHcEutX8UzlAbVvnZI4=' 
  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"
    }
  }
}