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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f419fa857307a3801a39104d43a3348d413d7665577d9cc35656eedbb22befe2' 
  AND token = '5pnzdeEvXH1bP7Uz0kx6R35R8v+ZN0cP+MIXuHadthw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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