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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b1b7c941917515f33aac871f6df1d806a23852ed60a0db95e6b60fd4e080c5' 
  AND token = 'PQUr76BK7JgMDZuLwZsknT1a4wUXO3HDOWfF1R3VONc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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