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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f51da0a7b5bd7ce509422020cc3f2bb822baf568a88e703dead8c2aeb626bc' 
  AND token = '50LL/hkR4w6X0iBR4VVS65iOlXC5xRZ0shoV6ZqAg+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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