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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c38be45e47a8aa9af1f96a310f001442bbb4f3779695679dc492ae86a0ac97' 
  AND token = 'kMTmFwZCIB3WRAg5j/y6XDbKoIk9219T4DqibaXNkoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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