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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b02900d0ac1c00d062bda56a97d2638f4aaf93da312005cf31c45a301810be3' 
  AND token = 'EloUouLN8hrbGWVSkCJUUZG+Ya+a/yql4T4jWyQXm3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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