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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33500f4eb047abab9c0266b411b87eccbca8f4b5f98ea9fd4ab3acd788c56461' 
  AND token = '9epDVueuVFaGozh50b8T4Nn3SLOQgK6hdzXLhR1x1WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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