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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f987e1b4db98d7d2cfd080136bded24ab73249902e2b58eeee420e0612895a' 
  AND token = '1ebcIlLBlqCCeIAcPzfUoP/GUJWLCUTEzEH6pMUuZII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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