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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec596d5e27a76db9526b17ce6189055e1f2f48c50619145a758ee0b05b3c35e' 
  AND token = 'JSZurrsCisNgMMvdMkmYt/2KO2Tv/AvWKwJ6ZO7PxMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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