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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad003573750bdf4595422055e1fe53a4fe4472578a48aecd041c8b12cb9658e' 
  AND token = 'o8PdAOHP8nxM/EC32Peg1bItRdae03EtQrq72QHFao0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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