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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07673f3fdcbe79f77d3f47ce25c1bf7019e04f1bc064c798a952e52c1238ec7e' 
  AND token = 'W5kpsgS+ZiCV+LA6gL3LVnikXhCgs39cnGt+6lsGgMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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