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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6969fd510de297285b175129f3dd137319da60dfe402eaca76c73ef8097b65e7' 
  AND token = 'LkIO/8B74yVZ3df7yBcPU2saY7Gcu+qD6JgNNDNdejE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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