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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bb34fe541b25c3d3a83735dc65407140fadd3810cdf7385f2b00b1350b1e5f' 
  AND token = 'uxprpowgr+F8JXhO2ZIghM8OprR4Nza6CRY7xzuSoI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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