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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac1c8875bf538dd954314586148a370072cc6e13422117d0c69ff2ea2baada2' 
  AND token = 'Bmr8Nf/YUX9+xmf6q4Dtc65serC+3vqx2U4U+lz3IrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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