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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf7556fe79d93e71151e1002bea08f2f6b98de65fc887f48159e2145a017dba' 
  AND token = 'aZoQ2dKSU4JEJ/Sc+gWVxSQ0DgDtDk6r03u/MA6yZlQ=' 
  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"
    }
  }
}