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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b912979449c0f5c7fb5daa408275e548f9bb50f39fb0d54c47430c09f9f2ce0' 
  AND token = 'CuVJISxVdJDUW0/Lr6S6K4s78lNGDIMo0bmSMcVmTHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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