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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b19fde241eec779005dc351f70de74cbd909562364fabb7c8506641b42a01f' 
  AND token = 'ik+LfisvN0z8mx9ie3oXOr5KAsn2dds1oJ6rFlM2IiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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