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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40dc158efe9ddd26535f5c231424bd0e3e2c1e6e2119fb1e665307a6b2529bd' 
  AND token = 'ETzODKVN/1ZFbuV0sVFydV8LKB3xyY9l35LuCdxeq80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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