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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58712e6dcf2470258b5f723aea632e5fcd7db8ef2c33082a5664a354c819dc26' 
  AND token = 'Kd3j7bMC6YF9cMfmp+w5h+8hRhE9u8u90S+wnWV/R+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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