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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fbfc05d273ac60ac4c82ae89ccf3c5ebb72b0d189ed0829b174aa96d6bc8fb' 
  AND token = 'Aj8hK++uxadJ7Q2vRRt2aVGQ0SgH8+ZMpZFD+relxto=' 
  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"
    }
  }
}