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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd20dbb076858ebda2da72bd3d1b62e8be5345907a595fdf55b7338887921acb' 
  AND token = '3+NuEnlYT0fXGCHPyahpSZunhTrVZtJ2es190gYbiCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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