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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760a6cc10cc991a1998e2301f3f443c1e1b979a65919f254243f4cc4c93d374d' 
  AND token = 'WVbpuAOGoKtMO1Nyo1LMgdAcXyKtf06CfOab4dR4B2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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