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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999aed38f07994d655958c42aab2b434dca0b53f5c269d5fd19e0232b49b7b68' 
  AND token = '9MLKNBKiLIb/NHM+3P8kIdgaTEYfPTjlNbZFmIr0AJc=' 
  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"
    }
  }
}