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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd65bd049a76f60526ce13ae5fa2d729bfca4cfce6a8ae97b6905fed80a1b10c' 
  AND token = 'J20brPTwzfXDvFX/YSzHIopVSpO4gRyQ4e/oKooQXrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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