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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5de26437caeb7623daa4909208c3a4bf4bed208fd842f14eb157cd714c28424' 
  AND token = 'VMrAXVx7JpzekNUKwPSD/rWLKsu/GAF2lD4+gGE0uxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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